Hi!
>> I like to use ntop (from ntop.org) for this, along with MRTG. Others prefer
>> cacti. I found MRTG easier to setup. It comes down to personal preference.
> MRTG provides graphs of usage, but I'm not aware of it providing a monthly
> total usage (or 95% or other) in report form (though would be happy to learn
> otherwise).
>> Does ntop provide a way to generate a monthly report?
Check RTG.
http://rtg.sourceforge.net/
Bye,
Raymond.